Atomic radii of the elements (data page)

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[edit] Atomic radii

Note: All measurements given are in picometres (pm).

number symbol name empirical calculated van der Waals covalent Triple-Bond Covalent Radii
1 H hydrogen 25 53 120 37 no data
2 He helium no data 31 140 32 no data
3 Li lithium 145 167 182 134 no data
4 Be beryllium 105 112 no data 90 85
5 B boron 85 87 no data 82 73
6 C carbon 70 67 170 77 60
7 N nitrogen 65 56 155 75 54
8 O oxygen 60 48 152 73 53
9 F fluorine 50 42 147 71 53
10 Ne neon no data 38 154 69 no data
11 Na sodium 180 190 227 154 no data
12 Mg magnesium 150 145 173 130 127
13 Al aluminium 125 118 no data 118 111
14 Si silicon 110 111 210 111 102
15 P phosphorus 100 98 180 106 94
16 S sulfur 100 88 180 102 95
17 Cl chlorine 100 79 175 99 93
18 Ar argon 71 71 188 97 96
19 K potassium 220 243 275 196 no data
20 Ca calcium 180 194 no data 174 133
21 Sc scandium 160 184 no data 144 114
22 Ti titanium 140 176 no data 136 108
23 V vanadium 135 171 no data 125 106
24 Cr chromium 140 166 no data 127 103
25 Mn manganese 140 161 no data 139 103
26 Fe iron 140 156 no data 125 102
27 Co cobalt 135 152 no data 126 96
28 Ni nickel 135 149 163 121 101
29 Cu copper 135 145 140 138 120
30 Zn zinc 135 142 139 131 no data
31 Ga gallium 130 136 187 126 121
32 Ge germanium 125 125 no data 122 114
33 As arsenic 115 114 185 119 106
34 Se selenium 115 103 190 116 107
35 Br bromine 115 94 185 114 110
36 Kr krypton no data 88 202 110 108
37 Rb rubidium 235 265 no data 211 no data
38 Sr strontium 200 219 no data 192 139
39 Y yttrium 180 212 no data 162 124
40 Zr zirconium 155 206 no data 148 121
41 Nb niobium 145 198 no data 137 116
42 Mo molybdenum 145 190 no data 145 113
43 Tc technetium 135 183 no data 156 110
44 Ru ruthenium 130 178 no data 126 103
45 Rh rhodium 135 173 no data 135 106
46 Pd palladium 140 169 163 131 112
47 Ag silver 160 165 172 153 137
48 Cd cadmium 155 161 158 148 no data
49 In indium 155 156 193 144 146
50 Sn tin 145 145 217 141 132
51 Sb antimony 145 133 no data 138 127
52 Te tellurium 140 123 206 135 121
53 I iodine 140 115 198 133 125
54 Xe xenon no data 108 216 130 122
55 Cs caesium 260 298 no data 225 no data
56 Ba barium 215 253 no data 198 149
57 La lanthanum 195 no data no data 169 139
58 Ce cerium 185 no data no data no data 131
59 Pr praseodymium 185 247 no data no data 128
60 Nd neodymium 185 206 no data no data no data
61 Pm promethium 185 205 no data no data no data
62 Sm samarium 185 238 no data no data no data
63 Eu europium 185 231 no data no data no data
64 Gd gadolinium 180 233 no data no data 132
65 Tb terbium 175 225 no data no data no data
66 Dy dysprosium 175 228 no data no data no data
67 Ho holmium 175 no data no data no data no data
68 Er erbium 175 226 no data no data no data
69 Tm thulium 175 222 no data no data no data
70 Yb ytterbium 175 222 no data no data no data
71 Lu lutetium 175 217 no data 160 131
72 Hf hafnium 155 208 no data 150 122
73 Ta tantalum 145 200 no data 138 119
74 W tungsten 135 193 no data 146 115
75 Re rhenium 135 188 no data 159 110
76 Os osmium 130 185 no data 128 109
77 Ir iridium 135 180 no data 137 107
78 Pt platinum 135 177 175 128 110
79 Au gold 135 174 166 144 123
80 Hg mercury 150 171 155 149 no data
81 Tl thallium 190 156 196 148 150
82 Pb lead 180 154 202 147 137
83 Bi bismuth 160 143 no data 146 135
84 Po polonium 190 135 no data no data 129
85 At astatine no data no data no data no data 138
86 Rn radon no data 120 no data 145 133
87 Fr francium no data no data no data no data no data
88 Ra radium 215 no data no data no data 159
89 Ac actinium 195 no data no data no data 140
90 Th thorium 180 no data no data no data 136
91 Pa protactinium 180 no data no data no data 129
92 U uranium 175 no data 186 no data 118
93 Np neptunium 175 no data no data no data 116
94 Pu plutonium 175 no data no data no data no data
95 Am americium 175 no data no data no data no data
96 Cm curium no data no data no data no data no data
97 Bk berkelium no data no data no data no data no data
98 Cf californium no data no data no data no data no data
99 Es einsteinium no data no data no data no data no data
100 Fm fermium no data no data no data no data no data
101 Md mendelevium no data no data no data no data no data
102 No nobelium no data no data no data no data no data
103 Lr lawrencium no data no data no data no data no data
104 Rf rutherfordium no data no data no data no data 131
105 Db dubnium no data no data no data no data 126
106 Sg seaborgium no data no data no data no data 121
107 Bh bohrium no data no data no data no data 119
108 Hs hassium no data no data no data no data 118
109 Mt meitnerium no data no data no data no data 113
110 Ds darmstadtium no data no data no data no data 112
111 Rg roentgenium no data no data no data no data 118
112 Uub ununbium no data no data no data no data 130
113 Uut ununtrium no data no data no data no data no data
114 Uuq ununquadium no data no data no data no data no data
115 Uup ununpentium no data no data no data no data no data
116 Uuh ununhexium no data no data no data no data no data

[edit] Notes

  • The radius of an atom is not a uniquely defined property and depends on the definition. Data derived from other sources with different assumptions cannot be compared.
  • † to an accuracy of about 5 pm

[edit] References

As quoted at http://www.webelements.com/ from these sources:

[edit] Atomic radius (empirical)

  • J.C. Slater, J. Chem. Phys. 1964, 41, 3199.

[edit] Atomic radius (calculated)

  • E. Clementi, D.L.Raimondi, and W.P. Reinhardt, J. Chem. Phys. 1963, 38, 2686.

[edit] Van der Waals radius

  • A. Bondi, J. Phys. Chem., 1964, 68, 441.

[edit] Covalent radius

  • R.T. Sanderson in Chemical Periodicity, Reinhold, New York, USA, 1962.
  • L.E. Sutton (ed.) in Table of interatomic distances and configuration in molecules and ions, Supplement 1956-1959, Special publication No. 18, Chemical Society, London, UK, 1965.
  • J.E. Huheey, E.A. Keiter, and R.L. Keiter in Inorganic Chemistry : Principles of Structure and Reactivity, 4th edition, HarperCollins, New York, USA, 1993.
  • W.W. Porterfield in Inorganic chemistry, a unified approach, Addison Wesley Publishing Co., Reading Massachusetts, USA, 1984.
  • A.M. James and M.P. Lord in Macmillan's Chemical and Physical Data, Macmillan, London, UK, 1992.

[edit] Triple-Bond Covalent Radii

[edit] See Also

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